1.1.1.263	hanging-drop vapour diffusion	
1.1.1.263	to 1.93 A resolution. The structure displays an empty substrate-binding site in an open conformation reflecting the enzyme state shortly after the release of product, presumably with bound oxidized cofactor NADP+. Amino-acid residues Lys94, His151, Trp162, Arg163, Asp176 and His180 are involved in substrate binding, catalysis or product release. The side chain of Lys94 seems to function as a molecular switch